ADDITIONAL INDUCTION ELIGIBILITY CRITERIA: Patients treated with prior surgery are eligible for this study if they otherwise meet eligibility criteria Patients are eligible >= 6 weeks after therapeutic 131I-MIBG provided that all other eligibility criteria are met ELIGIBILITY CRITERIA FOR ENROLLMENT ON THE RE-TREATMENT STUDY INTRA-OPERATIVE REGISTRATION/RANDOMIZATION CRITERIA POST-OPERATIVE REGISTRATION/RANDOMIZATION CRITERIA Note: G-CSF and platelet transfusions cannot be used to increase counts to meet eligibility criteria RE-REGISTRATION ELIGIBILITY CRITERIA (STEP 2): Patients randomized to Arm 1 may opt to switch to the 3-drug regimen following disease progression; these patients must be re-registered to the study and meet the eligibility criteria below RE-REGISTRATION ELIGIBILITY CRITERIA (STEP 2): Platelet count >= 50 x 10^9/L RE-REGISTRATION ELIGIBILITY CRITERIA (STEP 2): AST and ALT < 2.5 x upper limits of normal (ULN) RE-REGISTRATION ELIGIBILITY CRITERIA (STEP 2): Note: G-CSF and platelet transfusions cannot be used to increase counts to meet eligibility criteria INDUCTION ELIGIBILITY CRITERIA-STEP 1 POST-INDUCTION THERAPY ELIGIBILITY CRITERIA (PRIOR TO INTENSIFICATION-STEP 2) Patients should meet the eligibility criteria for RANDOMIZATION TO BLINATUMOMAB OR NO BLINATUMOMAB-STEP 3 ELIGIBILITY CRITERIA FOR SCREENING AND MOLECULAR PROFILING (STEP 0) ELIGIBILITY CRITERIA FOR RANDOMIZATION (STEP 1): ECOG performance status 0 or 1 within 2 weeks prior to randomization ELIGIBILITY CRITERIA FOR RANDOMIZATION (STEP 1): Patients must have completed treatment with any investigational agent >= 30 days prior to randomization for protocol therapy, if applicable ELIGIBILITY CRITERIA FOR RANDOMIZATION (STEP 1): Patients must be randomized within 24 weeks from surgery ELIGIBILITY CRITERIA FOR RANDOMIZATION (STEP 1): Platelets > 100,000 mm^3 ELIGIBILITY CRITERIA FOR RANDOMIZATION (STEP 1): Aspartate aminotransferase (AST, SGOT) =< 2.5 x ULN ELIGIBILITY CRITERIA FOR RANDOMIZATION (STEP 1): Alanine aminotransferase (ALT, SGPT) =< 2.5 x ULN STUDY SITE ELIGIBILITY: REGISTRATION ELIGIBILITY CRITERIA: REGISTRATION ELIGIBILITY CRITERIA (STEP 1) ELIGIBILITY CRITERIA (STEP 1) REGISTRATION/RANDOMIZATION ELIGIBILITY CRITERIA ELIGIBILITY CRITERIA FOR PREREGISTRATION (STEP 0): ELIGIBILITY CRITERIA FOR RANDOMIZATION (STEP 1): REGISTRATION ELIGIBILITY CRITERIA INCLUSION CRITERIA FOR SCREENING (STEP 0 - PREREGISTRATION) INCLUSION CRITERIA FOR TREATMENT ASSIGNMENT (STEP 1) Patients must have met eligibility criteria for the screening step Site must verify that there is no known change in the step 1 eligibility since initial registration REGISTRATION ELIGIBILITY CRITERIA (STEP 1) RANDOMIZATION ELIGIBILITY CRITERIA (STEP 2)